fix: Router failed to create ingress resource in fission namespace (#2951)

* Router failed to create ingress resource in `fission` namespace
```
fission-router has access to create ingress in default namespace.
fission is creating ingress in namespace where fission is installed.
updated the helm chart to give fission-router access to create ingress in release namespace.
```
* Add a todo comment for modifying router's permissions


---------

Signed-off-by: Md Soharab Ansari <soharab.ansari@infracloud.io>

charts/fission-all/templates/_fission-kubernetes-roles.tpl

@@ -354,6 +354,8 @@ rules:
 # TODO: Kept for future in case preupgrade needs any permissions in the future
 rules: []
 {{- end }}
+# TODO: Currently, router needs ingress related permissions only.
+# In future if router's permissions are modified then check the configured namespace.
 {{- define "router-kuberules" }}
 rules:
 - apiGroups:

charts/fission-all/templates/router/role-kubernetes.yaml

@@ -1,4 +1,4 @@
-{{- include "kubernetes-role-generator" (merge (dict "namespace" .Values.defaultNamespace "component" "router") .) }}
+{{- include "kubernetes-role-generator" (merge (dict "namespace" .Release.Namespace "component" "router") .) }}
 
 {{- if gt (len .Values.additionalFissionNamespaces) 0 }}
 {{- range $namespace := $.Values.additionalFissionNamespaces }}